Improvement in steam-boilers



t UNITED STATES PATENTN OFFICE.

IMPROVEMENT INl STEAM-solLl-:Rsl

Specification forming part of Letters Patent No. 26,701, dated January To all whom it may concern: s

Beit known that I, SEPTIMUS NoERIs, of Philadelphia, county of Philadelphia, in the State of Pennsylvania, have invented a new and useful Improvement in Steam-Boilers; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

` It has been customary in the construction of steam-boilers to form between the tubesheet and the fire-chamber a close combustion-chamber by the interposition of a water, wall or box connected with the water-spaces of the boiler, and such water-walls have had arranged with them water-grates. lt has also been customary to arrange within the fire-` chamber a series of water-boxes in connection with water-grates in such manner that said boxes and watergrates might be removed at pleasure, and when in the boiler the said boxes should form a chamber between the fire and tubesheet, having spaces left open to allow air to enter, and also means for admitting or forcing in a constant, supply of fresh air. The two constructions of boilers just mentioned are entirely different from each other, 011e having formed between the fire-chamber and tube-sheet a close chamber or box, the other an open chamber or one to which air is admitted, and in view of the difference in result between the two constructions Letters Patent of the United States were granted for the formation of the close chamber between the fire and tube-sheet after the use of an air-fed or open chamber similarly arranged in the boiler.

My invention relates to that construction of boiler in which a close chamber or simple combustion-chamber is formed between the iire and tube-sheet, and has for its object to so construct such a boiler that the Waterwall forming the close chamber and connected with water-grates shall have no permanent connection with the other parts of the boiler, but may be removed therefrom at pleasure, by which peculiarity of construction I am enabled not only to economically repair or replace such parts of the boiler, but also to readily convert an old wood-burning boiler furnace into a simple combustionchamber boiler to burn coal by simply cutting off the ends of the tubes, moving the tube-sheet back, and inserting the detachable f f i water-wall and water-vgrates`;` and to t use ends my invention consists inthe employnimnt p of a removable watery-wall so `airamgfml within the boiler as toform ibetweenthe `ti and tube-sheeta close box or simple comb tion-chamber and connectedl with the W gratos and water-spaces ofthe boiler; i

In the accompanying drawings felmtig section at the line x oc of Fig. l. `Eig, `3 represents a vertical cross-section at thelineii/y of Fig. l, and Fig/L represents Ia perspective i 1 view of the Water-wall and water-grates de-` tached from the boiler.

Similar letters denote the same parts in the l i dilterent views. i

A represents the ure-box; A?, the close or simple combustion`chamber; `B, the waist of the boiler; I, the tube-sheet; d, theA tubes, l, "l I and C the smoke-box. i

D is the removable water-wall, which coni i sists of a box, as represented, fitting closely to the bottom and sides of the flre-chamber y A, and connected to the water-space G in the i crown of the boiler by means of the circulating-pipes b, and communicating` with the water-grates c at the rear ends of lthe latter, ,3 which are supported at their forward ends by the water-bar f, sustained by the pipes g g',

which communicate with it and with the lower water-space of the boiler.` i

It will be observed that by the construct-ion i s i as represented a perfect circulation of the` water is kept up from the lower water-space (or where the water maybe supplied tothe 1 boiler) through the pipes g g', water-barf,"` l water-bars c, water-wall D, and pipes b tothe y water-space G at the crown of the boiler.

The pipes b are constructed in two parts, l coupled together by a screw-joint and `fitting into the crown-sheet at their upper and into l the top of water-box D at their lower ends,

with cone-joints tightened and loosened at pleasure by means of the screw-joint.`

The pipes g g are made in two parts,aslw i i A i illustrated, (see Figs. l, 2, and 3,) `boltedto-` gether by iianges in the ordinary pipe-coupi ling manner, and the lower one, g, bolted to the floor of the ash-pit, and the upper one, g', secured to or formed on the lower side of the water-bar f. The gate-bars c are screwed into the water-bar f and into the water-box D in the usual manner.

As already mentioned, the Water-box D is constructed to fit closely to the bottom and sides of the fire-chamber, and when placed therein packed air-tightwith claypacking, as illustrated by the yellow lines e, (see Figs. 2 and 3,) the object of which is to form an airtight close chamber, A2, between said waterwall and the tube-sheet I.

It will be seen that by my invention a simpleV combustionchamber boiler may be made Which will be precisely similar in its operation to those now made, and at the same time be capable of having its Waterwall and grate-bars readily removed to repair or replace them; but the greatest advantage gained by my invention is the economy and facility with which by my invention an old wood-burning locomotive may be converted to a coalburner-viz., by simply cutting off the forward end of the tubes, moving` the tube-sheet farther back into the .Waist of the boiler, and inserting,` the water-box D and its attachments.

I am aware a steam-boiler has been made in which the water-grates were removable, and also water-boxes supporting` their rear ends and partially separating the fire-chamber and ash-pit from a chamber between the' firechamber and tube-sheet; but I do not consider such a construction of boiler at all analogous to my invention, which is intended for and produces a result altogether different from that attained by the construction of boiler referred to.

I do not claim as of my invention the employmentrof removable water-grates or such feature in connection with removable WaterboXes partially separating the fire-chamber from an air-fed combustion-chamber; but

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

The employment of the removable waterwall D, fitting closely to the bottom and sides of the fire-chamber, substantially in the manner described, for the purposes set forth.

Intestimony whereof I have hereunto set my hand this 14th day of April, 1859.

SEPTIMUS NORRIS.

Vitnesses:

JAS. A. NoRRIs, WILLIAM GEO. NoRRis. 

